Refill and replacement cost calculator
Work out what toothbrush heads, razor blades, filters or other refills cost per year and over several years.
Simple calculator. We may merge overlapping tools later; this page stays online with its image. Uses the refill price and how often you replace it. How we research · How links work
The short answer
A $39.99 four-pack replaced every 13 weeks costs about $40 a year, or about $120 over three years.
Your refills
Yearly refill cost
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Planning examples
| Item | Pack | Interval | About per year |
|---|---|---|---|
| Toothbrush heads | $40 / 4 | 13 weeks | $40 |
| Razor cartridges | $30 / 8 | 4 weeks | $49 |
| Water filter | $25 / 1 | 8 weeks | $163 |
| Vacuum bags | $20 / 5 | 6 weeks | $35 |
Figures are round planning maths from the same formula as the calculator. Paste your shelf prices for a personal answer.
Compare before you buy
When two devices look similar, run both refill schedules. The cheaper handle can lose if heads cost more.
Common questions
What counts as a refill?
Toothbrush heads, razor cartridges, water-filter cartridges, vacuum bags, air-purifier filters, coffee pods. Anything you replace on a schedule.
How often should I replace toothbrush heads?
Many manufacturers suggest about every three months. Use the interval printed on your pack if it differs.
Does this include the device price?
No. Add the handle or machine separately if you want a full ownership total. This tool focuses on the recurring refill spend.
